86 



ALTERNATING CURRENTS 



This power is equal to that in the line, as there is no interven- 

 ing loss. Also, the line current 



and 



Iline = \/3 I CO H 

 Eline = E co il 



10 



115 -Volt Lamp Banks Connected in Y 

 17. 3 a. 



115-Volt Lamp Banks Connected in Delta 

 FIG. 85. Lamp loads in Y and in delta. 



Hence, substituting in the above equation 



P = \/3 En ne I l ine COS c oil ^ 



This equation is the same as equation (30) (page 83) for the 

 Y-system. This should be so, for the relations in a three-phase 

 line are the same whether the power originates in a delta- or in a 

 Y-connected generator. 



